LG 27GX790A Review: 4K OLED Gaming Without the Usual Trade-Offs
For years, buying a gaming monitor meant picking two out of three from resolution, refresh rate, and panel quality. Want 4K? You're probably capped around 144Hz and paying an IPS glow tax in dark scenes. Want blistering refresh rates and OLED's perfect blacks? You're likely looking at 1440p or lower. The LG 27GX790A is one of a new generation of panels attempting to make that trade-off obsolete, pairing a true 3840x2160 resolution with a 240Hz refresh rate on a genuine OLED panel — and after two weeks of gaming, working, and testing across everything from competitive shooters to slow, atmospheric single-player titles, we think it mostly succeeds, with a couple of caveats worth understanding before you spend $1,799 AUD on it.
**Panel Technology and Picture Quality**
This is a proper WOLED panel with LG's latest generation of brightness and anti-burn-in technology, not a cheaper QD-OLED alternative or a mini-LED panel dressed up in OLED marketing language. The practical result is exactly what OLED does best: true per-pixel blacks, essentially infinite contrast ratio, and colour that doesn't shift or wash out at extreme viewing angles. In dark, atmospheric games — the kind of content where IPS and VA panels have always struggled with backlight bloom around bright objects on dark backgrounds — this panel is simply in a different league. Starfields look genuinely black rather than dark grey, and the transition between a bright UI element and a pitch-black background has none of the "glow" that even good mini-LED panels still exhibit.
Peak brightness lands around 275 nits in SDR full-screen and can spike to roughly 1,300 nits on small HDR highlights, which is respectable for OLED technology but worth noting if you do a lot of gaming or work in a very bright room — this isn't a panel built to fight against direct sunlight the way some high-nit mini-LED displays are. In a normally lit room or the dim conditions most gaming sessions actually happen in, it's more than sufficient, and HDR content genuinely pops in a way SDR content simply cannot replicate on any panel technology.
Colour accuracy out of the box was excellent in our testing, with the factory-calibrated sRGB mode measuring well within professional-grade accuracy thresholds — good news if you also do any colour-sensitive creative work on this monitor alongside gaming.
**Refresh Rate and Motion Clarity**
The headline feature is the 240Hz refresh rate at full native 4K resolution, and it's worth being direct about what hardware you'll need to actually use it. Driving 4K at 240fps in modern AAA titles requires genuinely top-tier hardware — we're talking RTX 5080 or above, and even then, expect to lean on DLSS or FSR upscaling in the most demanding titles to hit anywhere near the panel's ceiling. If you're pairing this monitor with a mid-range graphics card, you'll be running well below 240fps in most current titles, and the panel's high refresh rate will largely go unused outside of older or less demanding games.
That said, for the audience this monitor is actually built for — enthusiasts running current flagship GPUs, or those who play primarily competitive titles that are less GPU-intensive even at 4K — motion clarity is outstanding. OLED's near-instantaneous pixel response time means there's essentially none of the motion blur or ghosting that even fast IPS panels still exhibit, and combined with the high refresh rate, fast-paced gameplay has a fluidity that's genuinely difficult to go back from once you've experienced it. We tested with both NVIDIA G-Sync and AMD FreeSync Premium Pro enabled at various points and had zero issues with tearing or stutter across either ecosystem.
**Burn-In: Addressing the Elephant in the Room**
Anyone considering an OLED monitor for gaming has almost certainly heard concerns about burn-in — permanent image retention from static on-screen elements like health bars, minimaps, or crosshairs. LG has made real strides in this generation of panels, with pixel-shifting technology that subtly moves the entire image by a few pixels at intervals, an automatic brightness reduction for static content, and a panel refresh cycle that runs during idle periods to even out pixel wear.
We can't meaningfully test long-term burn-in risk in a two-week review period — nobody can, and any review claiming otherwise is not being honest with you. What we can say is that LG's OLED panels have a multi-year track record now in both TVs and monitors, the company backs this panel with a warranty that explicitly covers burn-in for two years (worth confirming current terms with your retailer, as coverage specifics can change), and the built-in mitigation features are genuinely active rather than cosmetic. If you play a lot of games with permanent, high-contrast static UI elements — certain strategy games and MOBAs are the usual culprits — the risk is not zero, but it's considerably lower than the anxiety around this topic online might suggest, particularly with reasonable habits like enabling screen savers during breaks and not leaving the monitor on a static desktop background for days at a time.
**Design, Stand and Connectivity**
The stand is sturdy, with height, tilt, swivel, and pivot adjustment covering the full range most people need, though it does take up a reasonably large footprint on the desk. VESA mount compatibility is included if you'd prefer a monitor arm, which we'd actually recommend for this panel given its weight and the value of being able to angle an OLED screen precisely to avoid glare from overhead lighting.
Connectivity includes two HDMI 2.1 ports (essential for connecting a current-generation games console at full 4K/120Hz alongside a PC), one DisplayPort 2.1 connection capable of driving the full 4K/240Hz signal, and a USB-C port with 90W power delivery — genuinely useful if you're also using this as a docking hub for a laptop, letting you charge and drive the display over a single cable.
**Everyday Use and Text Clarity**
A fair concern with OLED monitors historically has been text rendering — the sub-pixel structure of some OLED panels can produce slight colour fringing on small text, which matters if this is also your primary work monitor. LG's panel handles this well; at native 4K resolution with standard Windows ClearType settings, text is crisp and we didn't notice meaningful fringing in normal reading distances during extended work sessions. It's not quite as immaculately clean as a good IPS panel at the same resolution for pure text work, but the difference is subtle enough that we don't think it should factor heavily into a purchase decision for most people.
**Value in the Australian Market**
At $1,799 AUD, this monitor sits at a genuine premium compared to high-refresh 1440p OLED alternatives, which can be found for several hundred dollars less. The premium buys you the jump to native 4K resolution while retaining the high refresh rate — previously an either/or proposition. Whether that's worth the extra spend depends heavily on your GPU: if you're not running hardware capable of meaningfully driving 4K at high frame rates, a 1440p OLED alternative will deliver a more consistently maxed-out experience for less money. If you've already got or are planning a top-tier GPU purchase, this monitor is built specifically to be the display that doesn't become the bottleneck.
**The Bottom Line**
The LG 27GX790A delivers on a combination of specs that simply wasn't available at this size and price even eighteen months ago: true 4K resolution, a 240Hz refresh rate, and genuine OLED picture quality, all in one panel without an obvious compromise baked in. Burn-in risk is a real, if increasingly well-managed, consideration for OLED buyers generally, and you'll need serious GPU horsepower to actually exploit the refresh rate ceiling at native resolution. For the audience with the hardware and budget to match, though, this is currently one of the most complete gaming monitors on the Australian market.
**Common Questions From Readers**
*Is this monitor suitable for console gaming as well as PC?* Yes, and it's a strong choice for current-generation consoles specifically because of the dual HDMI 2.1 ports, which support 4K at up to 120Hz on console hardware — you won't reach the full 240Hz ceiling on console, since no current console GPU can drive 4K at that frame rate, but 4K/120Hz is achievable in performance-mode titles on both major consoles and looks excellent on this panel. If console gaming is your primary use case, the monitor's capabilities exceed what current console hardware can fully exploit, which isn't a criticism of the monitor so much as a reflection of where console GPU power currently sits relative to PC flagship hardware.
*Should I be worried about OLED burn-in if I also use this monitor for office work with a taskbar and static windows?* This is a genuinely more relevant concern than gaming-only use, since office software tends to have more persistent, high-contrast static elements — taskbars, menu bars, and browser UI chrome that doesn't move for hours at a time. LG's pixel-shifting and screen-refresh technology helps mitigate this, but we'd recommend enabling auto-hide for your taskbar, using a dark theme where possible to reduce the contrast of static elements, and taking advantage of the monitor's built-in screen saver function during extended breaks. If your primary use case is genuinely all-day static office work with minimal gaming, a traditional IPS panel remains the more worry-free choice specifically for that scenario.
*What graphics card do I actually need to make this monitor worthwhile?* To meaningfully approach the 240Hz ceiling at native 4K in current AAA titles, you're looking at RTX 5080 or RTX 5090 tier hardware, generally with DLSS or FSR upscaling enabled in the most demanding titles. An RTX 5070 Ti or similar upper-mid-tier card will still deliver an excellent experience on this monitor, typically landing in the 100-160fps range in most current titles at native 4K with high settings — a very good outcome, just not fully exploiting the panel's maximum refresh ceiling. If your GPU is more modest than this, the monitor's 4K resolution and OLED contrast are still worthwhile, but you'd be buying more refresh rate headroom than your system can currently use.
*Does this monitor support variable refresh rate technology from both NVIDIA and AMD?* Yes — we tested with both G-Sync and FreeSync Premium Pro active at different points during our review and had no issues with either. The monitor doesn't require you to commit to one GPU ecosystem over the other, which is worth knowing if you might switch graphics card brands on a future upgrade without needing to replace the display.